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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-12-08 01:15:26 -0800
committerDavid S. Miller <davem@davemloft.net>2008-12-08 01:15:26 -0800
commit6eb55d172b5f6de65afdae6285f8d732e4785bf7 (patch)
treedbc81b2610db0e62cf2c69a0da9dfa68ea3ff8c1
parentb74ca3a896b9ab5f952bc440154758e708c48884 (diff)
downloadlinux-6eb55d172b5f6de65afdae6285f8d732e4785bf7.tar.bz2
dccp: Integration of dynamic feature activation - part 1 (socket setup)
This first patch out of three replaces the hardcoded default settings with initialisation code for the dynamic feature negotiation. The patch also ensures that the client feature-negotiation queue is flushed only when entering the OPEN state. Since confirmed Change options are removed as soon as they are confirmed (in the DCCP-Response), this ensures that Confirm options are retransmitted. Note on retransmitting Confirm options: --------------------------------------- Implementation experience showed that it is necessary to retransmit Confirm options. Thanks to Leandro Melo de Sales who reported a bug in an earlier revision of the patch set, resulting from not retransmitting these options. As long as the client is in PARTOPEN, it needs to retransmit the Confirm options for the Change options received on the DCCP-Response from the server. Otherwise, if the packet containing the Confirm options gets dropped in the network, the connection aborts due to undefined feature negotiation state. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/dccp/proto.c46
1 files changed, 6 insertions, 40 deletions
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index db225f93cd5a..0941f8fe1675 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -61,6 +61,9 @@ void dccp_set_state(struct sock *sk, const int state)
case DCCP_OPEN:
if (oldstate != DCCP_OPEN)
DCCP_INC_STATS(DCCP_MIB_CURRESTAB);
+ /* Client retransmits all Confirm options until entering OPEN */
+ if (oldstate == DCCP_PARTOPEN)
+ dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg);
break;
case DCCP_CLOSED:
@@ -169,7 +172,6 @@ EXPORT_SYMBOL_GPL(dccp_state_name);
int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized)
{
struct dccp_sock *dp = dccp_sk(sk);
- struct dccp_minisock *dmsk = dccp_msk(sk);
struct inet_connection_sock *icsk = inet_csk(sk);
dccp_minisock_init(&dp->dccps_minisock);
@@ -188,45 +190,9 @@ int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized)
dccp_init_xmit_timers(sk);
INIT_LIST_HEAD(&dp->dccps_featneg);
- /*
- * FIXME: We're hardcoding the CCID, and doing this at this point makes
- * the listening (master) sock get CCID control blocks, which is not
- * necessary, but for now, to not mess with the test userspace apps,
- * lets leave it here, later the real solution is to do this in a
- * setsockopt(CCIDs-I-want/accept). -acme
- */
- if (likely(ctl_sock_initialized)) {
- int rc = dccp_feat_init(sk);
-
- if (rc)
- return rc;
-
- if (dmsk->dccpms_send_ack_vector) {
- dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL);
- if (dp->dccps_hc_rx_ackvec == NULL)
- return -ENOMEM;
- }
- dp->dccps_hc_rx_ccid = ccid_hc_rx_new(dmsk->dccpms_rx_ccid,
- sk, GFP_KERNEL);
- dp->dccps_hc_tx_ccid = ccid_hc_tx_new(dmsk->dccpms_tx_ccid,
- sk, GFP_KERNEL);
- if (unlikely(dp->dccps_hc_rx_ccid == NULL ||
- dp->dccps_hc_tx_ccid == NULL)) {
- ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
- ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
- if (dmsk->dccpms_send_ack_vector) {
- dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
- dp->dccps_hc_rx_ackvec = NULL;
- }
- dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;
- return -ENOMEM;
- }
- } else {
- /* control socket doesn't need feat nego */
- INIT_LIST_HEAD(&dmsk->dccpms_pending);
- INIT_LIST_HEAD(&dmsk->dccpms_conf);
- }
-
+ /* control socket doesn't need feat nego */
+ if (likely(ctl_sock_initialized))
+ return dccp_feat_init(sk);
return 0;
}